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// CODE SNIPPET

Section 509 Incidental Uses

Building Code 2021 of Illinois > 5 General Building Heights and Areas > 509 Incidental Uses
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509.1 General

Incidental uses located within single occupancy or mixed occupancy buildings shall comply with the provisions of this section. Incidental uses are ancillary functions associated with a given occupancy that generally pose a greater level of risk to that occupancy and are limited to those uses specified in Table 509.1.
Exception: Incidental uses within and serving a dwelling unit are not required to comply with this section.
[F] TABLE 509.1
INCIDENTAL USES
ROOM OR AREA SEPARATION AND/OR PROTECTION
Furnace room where any piece of equipment is over 400,000 Btu per hour input 1 hour or provide automatic sprinkler system
Rooms with boilers where the largest piece of equipment is over 15 psi and 10 horsepower 1 hour or provide automatic sprinkler system
Refrigerant machinery room 1 hour or provide automatic sprinkler system
Hydrogen fuel gas rooms, not classified as Group H 1 hour in Group B, F, M, S and U occupancies; 2 hours in Group A, E, I and R occupancies.
Incinerator rooms 2 hours and provide automatic sprinkler system
Paint shops, not classified as Group H, located in occupancies other than Group F 2 hours; or 1 hour and provide automatic sprinkler system
In Group E occupancies, laboratories and vocational shops not classified as Group H 1 hour or provide automatic sprinkler system
In Group I-2 occupancies, laboratories not classified as Group H 1 hour and provide automatic sprinkler system
In ambulatory care facilities, laboratories not classified as Group H 1 hour or provide automatic sprinkler system
Laundry rooms over 100 square feet 1 hour or provide automatic sprinkler system
In Group I-2, laundry rooms over 100 square feet 1 hour
Group I-3 cells and Group I-2 patient rooms equipped with padded surfaces 1 hour
In Group I-2, physical plant maintenance shops 1 hour
In ambulatory care facilities or Group I-2 occupancies, waste and linen collection rooms with containers that have an aggregate volume of 10 cubic feet or greater 1 hour
In other than ambulatory care facilities and Group I-2 occupancies, waste and linen collection rooms over 100 square feet 1 hour or provide automatic sprinkler system
In ambulatory care facilities or Group I-2 occupancies, storage rooms greater than 100 square feet 1 hour
Electrical installations and transformers See Sections 110.26 through 110.34 and Sections 450.8 through 450.48 of NFPA 70 for protection and separation requirements.
For SI: 1 square foot = 0.0929 m2, 1 pound per square inch (psi) = 6.9 kPa, 1 British thermal unit (Btu) per hour = 0.293 watts, 1 horsepower = 746 watts, 1 gallon = 3.785 L, 1 cubic foot = 0.0283 m3.

509.2 Occupancy Classification

Incidental uses shall not be individually classified in accordance with Section 302.1. Incidental uses shall be included in the building occupancies within which they are located.

509.3 Area Limitations

Incidental uses shall not occupy more than 10 percent of the building area of the story in which they are located.

509.4 Separation and Protection

The incidental uses specified in Table 509.1 shall be separated from the remainder of the building or equipped with an automatic sprinkler system, or both, in accordance with the provisions of that table.

509.4.1 Separation

ILLUSTRATION
Where Table 509.1 specifies a fire-resistance-rated separation, the incidental uses shall be separated from the remainder of the building by a fire barrier constructed in accordance with Section 707 or a horizontal assembly constructed in accordance with Section 711, or both. Construction supporting 1-hour fire barriers or horizontal assemblies used for incidental use separations in buildings of Type IIB, IIIB and VB construction is not required to be fire-resistance rated unless required by other sections of this code.

509.4.1.1 Type IV-B and IV-C Construction

Where Table 509.1 specifies a fire-resistance-rated separation, mass timber elements serving as fire barriers or horizontal assemblies in Type IV-B or IV-C construction shall be separated from the interior of the incidental use with an approved thermal barrier consisting of gypsum board that is not less than 1/2 inch (12.7 mm) in thickness or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.

509.4.2 Protection

Where Table 509.1 permits an automatic sprinkler system without a fire barrier, the incidental uses shall be separated from the remainder of the building by construction capable of resisting the passage of smoke. The walls shall extend from the top of the foundation or floor assembly below to the underside of the ceiling that is a component of a fire-resistance-rated floor assembly or roof assembly above or to the underside of the floor or roof sheathing, deck or slab above. Doors shall be self- or automatic-closing upon detection of smoke in accordance with Section 716.2.6.6. Doors shall not have air transfer openings and shall not be undercut in excess of the clearance permitted in accordance with NFPA 80. Walls surrounding the incidental use shall not have air transfer openings unless provided with smoke dampers in accordance with Section 710.8.

509.4.2.1 Protection Limitation

Where an automatic sprinkler system is provided in accordance with Table 509.1, only the space occupied by the incidental use need be equipped with such a system.

Related Code Sections


1002.2 Change of Occupancy, Incidental Uses
Where a portion of a building undergoes a change of occupancy to one of the incidental uses listed in Table 509.1 of the International Building ...
Existing Building Code 2021 of Illinois > 10 Change of Occupancy > 1002 Special Use and Occupancy > 1002.2 Incidental Uses
1301.6.19 Performance Compliance Methods, Incidental Uses
Evaluate the protection of incidental uses in accordance with Section 509.4.2 of the International Building Code . Do not include those where ...
Existing Building Code 2018 of Illinois > 13 Performance Compliance Methods > 1301 General > 1301.6 Evaluation Process > 1301.6.19 Incidental Uses
1301.6.19 Performance Compliance Methods, Incidental Uses
Evaluate the protection of incidental uses in accordance with Section 509.4.2 of the International Building Code . Do not include those where ...
Existing Building Code 2021 of Illinois > 13 Performance Compliance Methods > 1301 General > 1301.6 Evaluation Process > 1301.6.19 Incidental Uses
Section 509 General Building Heights and Areas, Incidental Uses
[F] TABLE 509 INCIDENTAL USES ROOM OR AREA SEPARATION AND/OR PROTECTION Furnace room where any piece of equipment is over 400,000 Btu ...
Building Code 2018 of Illinois > 5 General Building Heights and Areas > 509 Incidental Uses
Section 509 General Building Heights and Areas, Incidental Uses
Incidental uses located within single occupancy or mixed occupancy buildings shall comply with the provisions of this section. Incidental uses ...
Building Code 2021 of Illinois > 5 General Building Heights and Areas > 509 Incidental Uses
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